Coal-cutting machine.



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G. LEICHNAM. CUAL CUTTING MACHINE. APPLIOATION FILED JUNE 14, 190s. 904, 623.

Patented NOV. 24, 1908.

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/NVf/vm/ GEQRGESLECHNAM,

G. LEICHNAM. GOAL GUTTING MACHINE. APPLIOATIONTILED JUNI: 14, 1906.

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G. LEICHNAM. 'y GOAL CTTING MACHINE. APPLICATION FILED v.TUNE 14, 1906.

Panted Nov. 24, 1908.

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Q) ATTORNEY.

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GEORGES LEIOHNAM, OF DENAIN, FRANCE.

COAL-CUTTNG MACHINE.

Specification o Letters Patent.

Patented Nov. 24, 1908.

Application filed June 14, 1906. Serial No. 321,736.

To all whom t may concern.:

Be it known that I, GEORGES LEICHNAM, a citizen ot' the Republic of France, and resident of Denain, France, have invented a new and useful Improvement in or Relating to Coal-Cutting Machines, which improvement is fully set torth in the following specification.

This invention relates to coal cutting machines with double cutting picks, for cutting coals, ore, etc.

The invention improves to a considerable extent the capacity or" percussion motors in the washing operation, permits the use of such motors in a greater number ot mines, and is carried out in a simpler manner than with the existing motors.

Tn order to make the explanations as clear as possible, the accompanying drawings show, by way of example, a construction ot a coal cutting machine according to this invention.

Figure 1 is a plan of the cutting apparatus with the cover removed; Fig. 2 is a side elevation; Figs. 3 and 4C are, respectively, a plan and an elevation ot' the cutting apparatus supporting the frame; Fig. 5 is a cross-section on the line 5-5 ot Fig. t; Fig. 6 is a longitudinal section (on the line 6-6 of Fig. 3) ot a portion of the trame. Figs. 7 and' S illustrate a detail. of the device :tor securing the machine to a supporting column. Figs. 9 and 10 are, respectively, a plan and an elevation of a bracket arm; Figs. 11 and 12 illustrate a cutting tool in elevation and section; Figs. 13 and 14k show'a cylinder of one ot' the engines; Figs. 15 and 16 are diagrammatic views ot the work executed by the coal cutting machine; Figs. 17 to 2() are general views in plan and in elevation.

The coal cutting machine comprises 1. A fiat box A, Figs. 1 and 2, made ot steel and closed by a cover A1, in the ribs ot which are wedged by means of wedges h 3 two similar motors M1 M2. The axes of said motors are in the same plane, placed symmetrically on each side ot the central axis ot the box, inclined towards each other. They have a reciprocating motion and work with direct blows without rotation, and are provided with short and light drills F1 F2 similarly constructed. Each drill has a single cutting edge formed with teeth unevenly dis- -tributed relatively to the longitudinal axis et the drill, as shown in Figs. 11 and 12. The drills F1, F2 are secured on the pistons ot the motors M1, M2, with the widest portion (that farthest from the longitudinal axis) of the cutting edge of one drill turned upwards and with the widest portion of the other drill turned downwards. The box A is provided in tront with two angle irons J J (Fig. 1) on each side of the drills, leaving for these a tree space and adapted to automatically direct backwards the dust produced by the work.

2. A frame in two parts B and C (Figs. 3 to 6) sliding one in the other. The longshaped member B is rigidly secured on the Jtrame A-Fig. l-by means of bolts A3. The same is made hollow and contains the pipe B1, supplying compressed air or the electric wires.

In the apparatus illustrated, the member B is divided inside into two compartments, one of which contains the pipe B1, the other serving tor the exhaust. The rack-bar Q is provided in the central rib and is traversed by the tooth ot a pawl K which is held applied by a spring K1, (Figs. 3 and 4i). The shitting is eii'ected by hand. The member C carries a set-screw I enabling, by means ot a key Il, a suitable tightening always to be obtained. Two recesses C1 and C2 are formed in the part C to connect the same by means of a bolt V1, (Figs. 9 and 10) with the shifting screw V ot the bracket L on which the part C itself is secured by the bolt E, (Figs. et, 5 and 6).

The apparatus is mounted on a carrier comprising 1. A column Gr (Figs. 17 to 19) carrying a collar H (Figs. 7 and S) capable of moving upon it and of being secured at any point by set screws h and a key h1. dThe axis X of the socket H1 carried by the collar is normal to the column, and the recess of H1 is of conical shape.

2. A bracket-arm L (Figs. 9 and 10) constituted byarigid bar in whichis formed a socket or recess L1 receiving the fixing bolt E ot the part C, which freely rotates about the axis Y. This rotation is obtained by the changing screw V, (Fig. 9), hereinbeiiore referred to, operated by a hand wheel WV, the guided nut ot said screw being connected to C by a bolt at V1, which is received in one of the recesses C1 C2. This screw is secured to the bracket-arm L by a bolt V2 (Fig. 10) enabling it to rotate about the axis Z. At one of the ends of the bracket arm L there is a bolt R which is received in the conical recess H1 of the collar-cup H. At the other end is pivoted by means of the bolt N1 a collar N formed with two jaws which are clamped by means of the bolt Y2 onto a second column, or a post S, or onto the same column already carrying the collar H (Figs. 17, 18, 19 and 20).

lVorking. Figs. 17 to 20. The column G being fixed between the inclosing ground, and the collar cup H fixed at a suitable level, the bolt It is introduced into and strongly tightened in the conical recess of the cup H1, the arm L being arranged .in the direction of cutting desired. Then the collar N is tightened on a beam or on a second colimm S. By means of the attachment bolt E in the cup or recess L1, the coal cutting inachine is arranged above or below, according to circumstances. The screw V is secured to L with a sufiicient play, above or below, by means of the bolt V2 and connected by its nut to the casing by means of the bolt V1 at C1 or C2.

The motors having been started, the attendant gives to the machine a circular movement, for instance, towards the left, by means of the hand wheel W acting' on the screw V. The tools thus trace a circle and cut coal to a depth Z and height m (Figs. 15 and 16). Having arrived at the end of its travel, the attendant advances the machine in the direction of its axis to the extent of' Z, then gives the whole machine a circular movement towards the right, and so on. During the movement towards the left (Figs. 15 and 16), the tool F1, the wide portion of which is at the top, does the cutting proper on the total height of its cutting edge and cuts a slice f1, at each blow, and the drill F 2, the wide portion of which is at the bottom, enlarges the cut downwards, by cutting a layer f2 and removing the small pieces that F1 might have accidentally omitted. During the movement towards the right, the same thing happens, only the parts are reversed. At each preliminary cutting, t-he angle irons J J arranged in front of the machine direct backwards the dust produced.

The machine or apparatus, illustrated by way of example in the accompanying drawing, is driven by compressed air. The motors are independent and suitably spaced so that their tools may not foul each other, and are inclined relatively to each other.` rl`he piston, (Fig. 14) is recessed to provide en'd rings or collars and at the end of its stroke, each operates directly upon the'liat reciprocating double acting slide valve serving only for admission. The shocks against the bottoms of the valve chest are deadened by a cushion formed by the air at exhaust pressure which is contained therein, and which escapes through the narrow orifices t of the cover. The exhaust takes place when the back or the front of the piston arrives at the orifice U arranged for that purpose in the wall of the cylinder at the side opposite the slide valve. The rotation of the drills is prevented by the keys D1 D2, which pass through the piston rods and rub against the frame oil" the machine.

The apparatus described is light; occupies very little space, and is easy to handle; it works methodically and uniformlyV and has simple and well protected motors. It can be used anywhere, cutting coal at any angle and any direction, at any level in the lode. It enables coal to be cut in passages only ten centimeters in height and does not require exceptionally solid ground.

Claims.

1. In a machine for cutting coal, a frame provided with a plurality of independentlyoperating cutting tools, a support, means for rotatably mounting' said frame on said support, mechanism whereby said frame may be rotated, and two fixed supports and means whereby said support is adjustable upon the fixed supports.

2. In a coal cutting machine, two percussion motors each having a non-rotatable cutting drill, in combination with a box supporting' both motors, a frame supporting said box and means for moving said box to cause the drills to move lengthwise of the trench and in the direction of the latter as cut, the cutting edge of each drill being formed with teeth on a plane perpendicular to the plane of the two motors, for the purpose of forming two dierent tracks of cutting and each cutting only a determined fraction of the total height of the definitive trench.

1n testimony whereof I have signed this specification in the presence of two subscribing witnesses.

GEORGE S LEICHNAM.

lVitnesses EMILE LEDRET, HANsoN C. Coxn. 

